Trash!

This opinion is after brushing it on, spraying it on and following their instructions.

Snake oil!

Use a good epoxy primer like PPG DP90LF.

Honestly, Rustolem out of a rattlecan holds up 10x better than POR-15!

I want my $@#! money back!

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.